MLA

The Political Libertines, or, Motion upon Motion [Graphic]. Sold by G. Bickham at the Black Moors Head, Exeter Change, by authority, 1741. https://collections.library.yale.edu/catalog/10700400.

APA, 6th edition

The political libertines, or, Motion upon motion [graphic]. (1741). [Caricatures and cartoons, Satires (Visual works) England 1741, Etchings England London 1741]. Sold by G. Bickham at the Black Moors Head, Exeter Change, by authority. https://collections.library.yale.edu/catalog/10700400.